diff --git a/src/services/apiKeyService.js b/src/services/apiKeyService.js
index 9d0a94dd..5d63e72f 100644
--- a/src/services/apiKeyService.js
+++ b/src/services/apiKeyService.js
@@ -947,9 +947,46 @@ class ApiKeyService {
           await pricingService.initialize()
         }
         costInfo = pricingService.calculateCost(usageObject, model)
+
+        // 验证计算结果
+        if (!costInfo || typeof costInfo.totalCost !== 'number') {
+          logger.error(`❌ Invalid cost calculation result for model ${model}:`, costInfo)
+          // 使用 CostCalculator 作为后备
+          const CostCalculator = require('../utils/costCalculator')
+          const fallbackCost = CostCalculator.calculateCost(usageObject, model)
+          if (fallbackCost && fallbackCost.costs && fallbackCost.costs.total > 0) {
+            logger.warn(
+              `⚠️ Using fallback cost calculation for ${model}: $${fallbackCost.costs.total}`
+            )
+            costInfo = {
+              totalCost: fallbackCost.costs.total,
+              ephemeral5mCost: 0,
+              ephemeral1hCost: 0
+            }
+          } else {
+            costInfo = { totalCost: 0, ephemeral5mCost: 0, ephemeral1hCost: 0 }
+          }
+        }
       } catch (pricingError) {
-        logger.error('❌ Failed to calculate cost:', pricingError)
-        // 继续执行，不要因为费用计算失败而跳过统计记录
+        logger.error(`❌ Failed to calculate cost for model ${model}:`, pricingError)
+        logger.error(`   Usage object:`, JSON.stringify(usageObject))
+        // 使用 CostCalculator 作为后备
+        try {
+          const CostCalculator = require('../utils/costCalculator')
+          const fallbackCost = CostCalculator.calculateCost(usageObject, model)
+          if (fallbackCost && fallbackCost.costs && fallbackCost.costs.total > 0) {
+            logger.warn(
+              `⚠️ Using fallback cost calculation for ${model}: $${fallbackCost.costs.total}`
+            )
+            costInfo = {
+              totalCost: fallbackCost.costs.total,
+              ephemeral5mCost: 0,
+              ephemeral1hCost: 0
+            }
+          }
+        } catch (fallbackError) {
+          logger.error(`❌ Fallback cost calculation also failed:`, fallbackError)
+        }
       }
 
       // 提取详细的缓存创建数据
@@ -994,7 +1031,15 @@ class ApiKeyService {
           )
         }
       } else {
-        logger.debug(`💰 No cost recorded for ${keyId} - zero cost for model: ${model}`)
+        // 如果有 token 使用但费用为 0，记录警告
+        if (totalTokens > 0) {
+          logger.warn(
+            `⚠️ No cost recorded for ${keyId} - zero cost for model: ${model} (tokens: ${totalTokens})`
+          )
+          logger.warn(`   This may indicate a pricing issue or model not found in pricing data`)
+        } else {
+          logger.debug(`💰 No cost recorded for ${keyId} - zero tokens for model: ${model}`)
+        }
       }
 
       // 获取API Key数据以确定关联的账户
diff --git a/src/utils/costCalculator.js b/src/utils/costCalculator.js
index a8ccec50..e2e0cc91 100644
--- a/src/utils/costCalculator.js
+++ b/src/utils/costCalculator.js
@@ -15,6 +15,12 @@ const MODEL_PRICING = {
     cacheWrite: 3.75,
     cacheRead: 0.3
   },
+  'claude-sonnet-4-5-20250929': {
+    input: 3.0,
+    output: 15.0,
+    cacheWrite: 3.75,
+    cacheRead: 0.3
+  },
 
   // Claude 3.5 Haiku
   'claude-3-5-haiku-20241022': {
diff --git a/web/admin-spa/src/stores/apistats.js b/web/admin-spa/src/stores/apistats.js
index cf5828c0..2d1054ed 100644
--- a/web/admin-spa/src/stores/apistats.js
+++ b/web/admin-spa/src/stores/apistats.js
@@ -92,11 +92,19 @@ export const useApiStatsStore = defineStore('apistats', () => {
       return queryBatchStats()
     }
 
-    if (!apiKey.value.trim()) {
+    const trimmedKey = apiKey.value.trim()
+
+    if (!trimmedKey) {
       error.value = '请输入 API Key'
       return
     }
 
+    // 验证 API Key 格式：长度应在 10-512 之间
+    if (trimmedKey.length < 10 || trimmedKey.length > 512) {
+      error.value = 'API Key 格式无效：长度应在 10-512 个字符之间'
+      return
+    }
+
     loading.value = true
     error.value = ''
     statsData.value = null
@@ -105,7 +113,7 @@ export const useApiStatsStore = defineStore('apistats', () => {
 
     try {
       // 获取 API Key ID
-      const idResult = await apiStatsClient.getKeyId(apiKey.value)
+      const idResult = await apiStatsClient.getKeyId(trimmedKey)
 
       if (idResult.success) {
         apiId.value = idResult.data.id
@@ -431,7 +439,7 @@ export const useApiStatsStore = defineStore('apistats', () => {
     const keys = apiKey.value
       .split(/[,\n]+/)
       .map((key) => key.trim())
-      .filter((key) => key.length > 0)
+      .filter((key) => key.length >= 10 && key.length <= 512) // 验证 API Key 格式
 
     // 去重并限制最多30个
     const uniqueKeys = [...new Set(keys)]